钛铌氧化物用于锂离子电池负极的研究进展

孙德旺, 蒋必志, 袁涛, 郑时有

Research progress of titanium niobium oxide used as anode of lithium-ion batteries

Dewang SUN, Bizhi JIANG, Tao YUAN, Shiyou ZHENG

图2 锂的嵌入-脱出过程中LixTiNb2O7的结构变化(图a-b)(a) 在初始放电过程中收集的原位XRD图，并以1.0 V和3.0 V之间的恒定电流C/8进行充电[22]；(b) 由“Le Bail”计算出的晶胞体积V和晶格参数b (x由容量得出；空心圆：放电时；实心点：充电时)[22]；(c-f) TiNb2O7在放电过程中的锂化过程[23]：(c) TiNb2O7，(d) Li0.88TiNb2O7，(e) Li2.67TiNb2O7，(f) Li4TiNb2O7；(g)Ti2Nb10O29电极材料第一圈充/放电曲线[24]；(h) Ti2Nb10O29电极材料在电压窗口为1.0～2.5 V的循环伏安曲线[24]

Fig. 2 Structural changes of LixTiNb2O7 during Li insertion-extraction(a-b). (a) in situ XRD patterns collected during initial discharge and charge at a constant current rate of C/8 between 1.0 V and 3.0 V[22]; (b) Unit cell volume V and lattice parameter b calculated from “Le Bail fitting” as a function of “x” in LixTiNb2O7 (“x” is derived from capacity obtained; open circle: during discharge; solid dot: during charge)[22]; (c-f) lithiation process of TiNb2O7 during discharge process[23]: (c) TiNb2O7, (d) Li0.88TiNb2O7, (e) Li2.67TiNb2O7, (f) Li4TiNb2O7; (g) first discharge/charge curve for Ti2Nb10O29 electrodes[24]; (h) cyclic voltammogram curves for Ti2Nb10O29 electrodes in voltage range of 1.0～2.5 V[24]